Increasing Savagery is a rare Sorcery card from Duel Decks: Mind vs. Might (DDS), collector number 47. Current market price: $0.38, TCGplayer market prices via Scryfall.
Put five +1/+1 counters on target creature. If this spell was cast from a graveyard, put ten +1/+1 counters on that creature instead. Flashback {5}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)